published journal_Esther Malgwi & Dr. Sagada

International Journal of Energy and Environmental Research (IJEER)
Vol.2, No.1, pp.55-74, March 2014
Published by European Centre for Research Training and Development UK (www.ea-journals.org)
AN EVALUATION OF THERMAL COMFORT CONDITIONS IN
AN URBAN ENTERTAINMENT CENTRE IN HOT-DRY
CLIMATE OF NIGERIA.
Malgwi Mohammed Esther1
& Dr. Musa L. Sagada2
1
Department of Architecture, Faculty of Environmental Design. Ahmadu Bello
University, Zaria, Nigeria
2
Department of Architecture, Faculty of Environmental Design. Ahmadu Bello
University, Zaria, Nigeria
Correspondence: Malgwi Mohammed Esther, Department of Architecture, Faculty of
Environmental Design. Ahmadu Bello University, Nigeria. Tel: 234-81-3209-0867.
ABSTRACT: Building designs in Nigeria now tend towards mix-use functions as in the case of
an urban entertainment centre, therefore, making thermal comfort a necessity. Unfortunately in
the hot-dry climatic regions of Nigeria, buildings fulfill this requirement through total dependence
on mechanical means of cooling to solve for overheating. It was evident that some design
parameters caused this undesirable situation. The study therefore focused on understanding and
evaluating the effects of design-dependent elements such as thermal mass, glazing size and type,
solar orientation, shading and vegetation on thermal comfort conditions in Silverbird galleria.
Data loggers were used to record temperature and humidity data in predetermined spaces. Data
was collected during certain periods in April, May, and June 2013. To analyze the design
dependent variables, hypotheses were developed and statistically tested using ANOVA. The study
revealed that thermal mass, glazing size/type and solar orientation were most effective on the
thermal performance of silverbird galleria. Furthermore, other design parameters not provided,
might have had an influence on the thermal performance of the Silverbird Galleria when shading
or sun control devices, open space and surrounding vegetation are considered. Autodesk Ecotect
2011 was also used to carry out simple simulation test to check for the overall thermal
performance of the Existing UEC and proposed UEC. Deductions from the simulation test
revealed that brick blocks performed better than concrete, double reflective glazed_lowE alum
frame performed better than single glazed alum frame and larger openings facing north-south
direction performed better than larger openings facing east-west direction. The results of this
research helped to highlight the key thermal efficient features that enhance thermal comfort which
can be applied in the design of an urban entertainment centre in hot dry climate of Nigeria.
KEYWORDS: Thermal Comfort, Data Logger, Urban Entertainment Centre, Material of
Building Envelope, Thermal Mass, Building Orientation.
INTRODUCTION
Thermal comfort is often related to the condition of an individual’s mind which expresses
satisfaction or dissatisfaction with the thermal environment. Man has, for the most part, strive
to create a thermally comfortable environment. This is reflected in building traditions around
the world - from ancient history to present day. A healthy and comfortable thermal environment
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of indoor workspace helps the users to improve their work efficiency by maintaining various
comfort related parameters within the desired range, Shanu (2010). Today, creating a
thermally comfortable environment is still one of the most important parameters to be
considered when designing public buildings such as an urban entertainment centre. Due to the
rapid growth in urban areas and global warming, the issue of thermal comfort conditions have
gained great attention. Khaliq (2009) states the importance of the thermal comfort in a daily
life cannot be denied, whether it is related to indoors such as an urban entertainment centre or
outdoors such as recreational parks.
Jason (2005), states that an urban entertainment building which is usually family-oriented
entertainment destinations, integrating entertainment with retail, dining, recreational and
cultural facilities should be able to cater for both the physical and psychological needs of its
users by creating a human thermal environment. Achieving thermal comfort in UECs has
been a challenge especially in hot-dry regions of Nigeria. Builders and designers usually do
not pay attention to the thermal performers of their buildings, Ahmed (2012).
In recent times, most building designs in Nigeria tend towards mix-use functions as in the
case of an urban entertainment centre where shopping, entertainment and recreation fall under
the same roof. This has made thermal comfort a necessity in the design of such buildings. In
order for the human body to achieve thermal balance, it must be protected from the effects of
severe outdoor conditions. On the other hand, most urban entertainment centres in hot-dry
climate fulfil this requirement with the help of air conditioning and cooling units.
Consequently, since thermal comfort varies from one climatic zone to another, buildings
having mix-use functions (i.e. urban entertainment centres) are expected to be designed in
relation to the climatic zone. Unfortunately, there is great reluctance, especially in Nigeria,
where builders and designers do not pay attention to the thermal performance of their
buildings, despite existing knowledge regarding design solutions which provide thermal
comfort conditions in a building. In view of these problems, architects should understand that
they must design buildings which not only have minimum cooling loads but also provide
thermal comfort for their occupants. Moreover, it will be a logical approach for architects to
pay attention to local climatic conditions during the design process. To this end, the aim of the
research was to analyse the effects of design-dependent elements on thermal comfort
conditions in an urban entertainment centre in hot-dry climate of Nigeria. The first objective
of the research was to investigate the thermal behaviour of the predetermined spaces in the
urban entertainment centre in terms of temperature and relative humidity. The second
objective was to determine which design-dependent variables were most effective on the
thermal performance of the urban entertainment centre.
LITERATURE REVIEW
Thermal comfort is defined in the ISO 7730 (1994) and ASHRAE standards 55-66 as “the
condition of the mind that which expresses satisfaction with the thermal environment”. Cheung
(2003) states that, thermal comfort occurs when there is a thermal equilibrium in the absence
of regulatory sweating and the heat exchange between the human body and the environment.
The most commonly used indicator of thermal comfort is air temperature because it is the most
easy to use and people can rate it without any difficulty. Although it has vital importance,
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however, it is not the only parameter that can be used to define thermal comfort very accurately.
According to Khaliq (2009), air temperature should always be considered in relation to other
environmental and design factors. Temperature and relative humidity are the two local climatic
factors that affect indoor comfort while building envelop, orientation, shading, glazing type and
size, vegetation, thermal mass are the design dependent parameters that contribute to the
thermal comfort condition in a mixed-used building such as an urban entertainment centre.
Another set of factors affecting thermal comfort are known as the human thermo-regulatory
factors. Although these factors are independent to each other, they have collectively a great
impact. Thermo-regulatory factors are not considered further in this research, because it is
outside the scope of the study.
There are many models developed by people to assess the thermal comfort indoor but for
outdoor conditions their list is very short. The fundamental work by Fanger (1970); indicated
that model is based on the heat balance conditions of the human body.
The predicted mean vote (PMV) is a thermal sensation scale. The mean opinion of a large group
of individuals expressing a vote on their thermal feeling under different thermal circumstances
has been used to provide an index to thermal comfort. A PMV value of zero provides the
optimal thermal comfort conditions. Ahmed (2012) states that, a positive PMV value means
that the temperature is higher than optimal, while a negative value means that it is lower. The
comfort zone is generally regarded as stretching from a slight feeling of cold (termed ‘fresh’,
when the PMV is -1) to a slight feeling of warmth (termed ‘mild’, when the PMV is +1).
The predicted percentage of dissatisfied (PPD) is an indication of the percentage of people
susceptible to feeling too warm or too cold in a given thermal environment. It can be deduced
from the PMV that if, for instance, the PMV is in the range -1 to +1, then the PPD index shows
that 25% of the population will be dissatisfied. To reduce this figure to 10%, then the PMV has
to be in the range -0.5 to +0.5, (Fanger 1970). Due to some limitations the ISO (Internal
standards organization) standard 7730(ISO1984), “Moderate Thermal Environment-
determination of the PMV and PPD indices and specification of the conditions for thermal
comfort” used limits on PMV as an explicit definition of the comfort zone.
The adaptive approach is not based on the heat balance equilibrium between human body and
environment but on observations. Depending upon the observations, there are ranges of actions
which can be performed in order to achieve thermal comfort. In a human body, brain
temperature is a sensor to regulate the temperature of the whole body. It acts as a control to
maintain the thermal comfort conditions between the body and environment, (Shanu 2010). If
changes occur in the environment or somewhere else, the brain equilibrium will deviate from
the close limits of thermal comforts, and then action is taken to restore the brain to close limits,
(Ahmed 2012).
Comfort zone
According to Çakir (2006), thermal comfort in an interior space can be considered as the sum-
total of heat or cold sensations experienced by occupants. Further, if the interior space has
neither excessive heat nor cold conditions, it is then considered to be thermally comfortable.
This reveals that the space is within an occupant’s comfort zone. Thus, the comfort zone may
be defined as a thermal condition in which little or no effort is required by occupants to adjust
their bodies to surrounding environmental conditions.
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Notice that most people are comfortable at higher temperatures if there is lower humidity. As the
temperature drops, higher humidity levels are still within the comfort zone. Occupational safety
and health services (1997) OSAHS, provided a thermal comfort standard for sedentary
occupations applicable in any climatic zone. According to the standard, most people will be
thermally comfortable in the following conditions;
Air temperature : heat periods (19ºC-24ºC) cold periods (18ºC-22ºC)
Relative humidity : 40%RH-70%RH
Air speed : 0.1-0.2 m/s, without creating draught
Radiant heat : no direct exposure to radiant heat source
Other experiment happens to be science based, and so could not be part of this study. In this
research the documentation of thermal comfort is not generalized as it’s conducted in locations
identified as the research area.
Hot-dry climate
As stated by the MNRE, (2010) the Ministry of New and Renewable Energy, hot-dry climatic
region is characterized by very high radiation levels, ambient temperature and relatively average
humidity. Countries that are found in such climates are Nigeria, Niger, Egypt, Syria, Malaysia,
Saudi Arabia, and United Arab Emirates. According to community portal of Nigeria (2012), the
climate of Abuja (capital city of Nigeria) is hot-dry for most periods of the year. The mean
daytime temperature for most stations in the Federal Capital Territory (FCT) is about 38ºC. The
highest temperature of about 40ºC is normally experienced between March and June while
minimum of about 30ºC are recorded in December and January (Ahmed, 2012).
Historical development and trends in urban entertainment centres (UEC)
The development of the modern UEC is based on the crisis of the classical retail trade.
Beginning in the 1960 and 1970, the trend therefore went for years to shopping centres where
numerous different businesses were offered to the consumer under a roof. Classical forming
out of shopping centres consists of a Mall in the Centre with one anchor tenant each at each
side. This form is also called "dog bone". Shopping centres are usually closed buildings with
numerous passenger car-parking bays, (Thomas, 2002).
According to Jason (2005), UEC have been developed everywhere with trends like theme parks,
sport arenas, indoor leisure sites, centre parks, multiplex cinemas and or musical theatres. These
centres, often dedicated to a special theme, combine different leisure functions with retail trade
and entertainment. Because of their huge size, growing number and needful catchment areas, their
spatial impacts are immense. Jason (2005) further noted that it is necessary for environmental
professionals (architects, planners and engineers) and politicians to think about
connected issues like the roles of UECs within the city structure, its influence on traffic and
economic impacts to existing structures of retail trade and leisure functions. The environment
format examined here is led by the provision of leisure and entertainment facilities and they
are referred to as ‘entertainment. centres'
The shop tenants in these examples are restricted to specific types, which tend to be specialist
shops that are recreationally focused, rather than comparison fashion retailers. The purchasing
is generally impulse-driven, which is more dependent on the ‘fee experiencing the place or
participating in the entertainment activities. Entertainment centres
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require a sufficiently sized attraction to guarantee a level of attention to the Centre (Haynes,
Joel & salil 1997).
Urban entertainment centres are a partnership between retail and entertainment and created by
variations of retail and entertainment combinations. They are generally compared to shopping
malls in almost every respect, but scale. UECs are not the stereotypical indoor climate
controlled centres like malls, but incorporate a variety of outdoor plazas, corridors, paths,
trails, courtyards, and interior spaces. The crucial criterion for a UEC is the kind of the
entertainment and complementary functions. This covers often a multiplex cinema, a
musical/concert hall or open space, a gaming house, recreational facilities or indoor games
(e.g. bowling, snooker) and are sometimes individualized components.
UEC
ENTERTAINMENT RETAIL
MOVIE THEME SHOPPING OUTLET
HALL(MULTIPLEX) PARK+OTHERS + RESTUARANTS
Figure 1. Basic components of UEC (Thomas, 2002)
CHALLENGES OF ACHIEVING THERMAL COMFORT IN URBAN
ENTERTAINMENT CENTRES
In tropical countries such as Nigeria, according to the world summit held in Johannesburg,
2001, thermal comfort of a person in these regions lies between 19 ºC and 24 ºC. Providing
thermal comfort in this range to occupants is a challenge for building designers especially if
applied in mixed-use buildings such as a UEC. Most urban entertainment buildings use air-
conditioning systems to achieve thermal comfort, which consume a lot of energy. The primary
function of an urban entertainment building envelope is to protect the occupants of the
building from the heat of the sun, rains, dust and provide a congenial environment for
entertainment, work and leisure. To achieve this, it is necessary that the design measures
adopted should result in the balance of natural ventilation, space conditioning, and lighting.
The first step towards achieving thermal comfort in such a large scale building is to integrate
suitable bio-climatic design principles with respect to the region while designing the
macroclimate and microclimate of the site.
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The climatic design varies from one climate zone to the other. Nigeria has six climatic zones
representing varying climatic conditions, ranging from extreme cold conditions to extreme
hot and dry conditions. Therefore an urban entertainment building designed for hot-dry
climate should have features to reduce solar gain, like smaller window size, shaded walls,
minimum exposure to west and east directions, use of external wall and roof insulation, or
design elements like solar chimneys, wind towers, water-based features to aid in the cooling
of spaces and so on to maximize ventilation, (Çakir 2006).
METHOD
This is basically a quantitative research. The objective of this research is focused on design-
dependent elements and their possible effects on thermal performance of the urban
entertainment centres in hot-dry climate of Nigeria. The study adopted the case study
methodology, because this allows the researcher to explore and understand complex issues
(Zaidah, 2007).
Sampling
Veal (2006) noted that case study selection was comparable to sampling in a quantitative
research and that cases were usually purposely selected. This meant that cases were identified
for study due to their inherent qualities which were in consonance with the phenomenon
under investigation (Oluigbo, 2010).The sampling method used was a purposive sampling in
which the building chosen typified the particular character.
Population of study
The population of study is with respect to the building and not its users’, this is due to the
nature of the variables and research method which is quantitative or objective. According to
Zaidah (2007), a case study research could either be a single-case deign (in which the case
typifies a particular character) or multiplex-case design depending on the nature of the
research. This research adopted the single-case design due to the buildings
representation as an urban entertainment Centre, time constraint, proximity, geographical
location (hot-dry climate) and ease of collection of data. To this end, the galleria
(silverbird), Abuja was purposely selected because it was extremely atypical or
representative, information-rich, and its location being the only urban entertainment centre in
the hot-dry region.
Survey instrument
The research is a Field study. Tiny-tag (see plate 1) data logger was used for the collection of
temperature and relative humidity simultaneously which are the two local climatic parameters
affecting indoor thermal comfort at 30 minutes intervals. Data loggers can be located only
inside. Certain precautions have to be taken while using this sensitive tool; for example,
interior data loggers should not be located close to walls or openings, in the path of direct
sunlight and frequent air movements, near heat or moisture producing sources. These also
should be kept away from heat/cool sources and moisture producing sources. Data loggers are
launched and offloaded by the software called Gemini Data Logger Manager. The tabular data
can be exported to spread sheet documents to develop the comparison graphs.
In order to exclude external microclimatic influences, the study had to be performed under
possible uncooled and unoccupied conditions. This meant that no one was able to enter the
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selected spaces to perform any activity whatsoever. Therefore, suitable unoccupied spaces were
selected to record humidity and temperature data during the months of (April, May, and June)
2013.
Plate 1. Tiny-tag data logger. ( www.tinytag.info)
Case study building
The Silver-bird Galleria building was the case study building, which is situated in Abuja municipal area.
This building is a High-rise structure, and was constructed in 2009. It includes 12 screen multiplex
cinemas, 8 VIP lounges, game arcades, retail shops, stores and administrative offices. It’s a six
storey building having total site area of 35,000sqm, the area of theatre complex is 3,700sqm, office tower
is 296sqm, generator is 186sqm, security is 195sqm, landscaped area is 17% and paved area is 57.5%.
The building form is rectangular elongated on the north-south axis [see plate 2]. It has concrete curtain
walls having 225 mm thickness with extensive use of steel and glass material. All the windows are made
of tampered glass which is reflective and double glazed. The roof is partly decked and drained with pipes
at the exterior, while other areas are covered with fiber-boards to serve as atrium and its interior floors are
covered with decorative hardware tiling. [See figures 2, 3, and 4 showing floor plans, in which spaces
investigated are also marked].
Plate 2. Aerial view of case study site [silverbird galleria, Abuja, Nigeria] (Google maps 2014)
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Data collection
Table 1. shows the data sets collected for certain days in April, May, and June 2013. These
data sets are listed in the first column, while dates for data recordings, Room numbers and
data logger identity are given in the 2nd, 3rd and 4th columns respectively.
Table 1. Data sets collected in April, May, and June, 2013.
DATE ROOM/SPACE DATA LOGGER
DATA SET 1 7th
-14th
April 2013
Shop
1 (conc. wall) DL1
Shop
2 (brick wall) DL2
DATA SET 2 18th
-24th
May 2013
Shop
3 (conc. wall) DL 1
Shop
4 (brick wall) DL 2
DATA SET 3 24th
-27th
June 2013
Cinema 2(conc.
wall) DL 1
Cinema 7(conc.
wall) DL 2
Table 2. test space selection criteria. Source: Author (2013).
SELECTION CRITERIA JUSTIFICATION SPACE
Occupancy Unoccupied spaces 1st
floor and 3rd
floor are
completely occupied.
Cooling Mechanical cooling switched
off
In Shop 1, shop 2, shop 3,
shop 4, cinema 2 and cinema
7, the mechanical cooling
switched off when
unoccupied.
Access Certain floors were Out of
bound
5th
Floor and Basement were
out of bounds.
Available spaces Spaces most suitable for
measurements
Floor: ground floor, 2nd
floor
and 4th
floor.
Spaces: shop 1, shop 2, shop
3, shop 4, cinema 2 and
cinema 7.

Vol.2, No.1, pp.55-74, March 2014
Data analysis
According to Veal (2006), all forms of analysis are possible within the context of a case.
Hypotheses were formulated and then tested by conducting Analysis of Variance (ANOVA) to
show if there is a significant difference between the temperatures of the rooms; and their
levels of humidity. If a significant difference was determined then the reasons behind this
difference were investigated in terms of the design-dependent parameters influencing the
thermal conditions within. In this context, the ANOVA at a 5 % level of significance was
applied and the following [Null hypotheses] were tested for Data Sets 1; 2; and 3.
Ht01: There is no difference between the temperatures of the rooms, Ht02: There is no
difference between the humidity of the rooms.
Limitation of study
The current study has several limitations. Ideally, the field measurements of the two thermal
comfort parameters at the pre-determined spaces should be recorded simultaneously.
However it should be noted that collecting data concurrently for the whole building was
impossible due to shortage of data loggers. In course of the work, a data logger was taken by
an unknown individual who at the beginning of the work was clearly stated by the
management to be at owners’ risk.
RESULTS
All three data sets are presented, for each selected spaces. In the temperature graphs the x-
axis shows the date of recording period and the y-axis shows the temperature in degrees C. In
humidity graphs, the x-axis shows the date of recording period and the y-axis shows the
relative humidity as percentage.
Data set 1
This data set was recorded in shop1 and shop 2 concurrently. Shop 1 and shop 2 are located
opposite to each other in the corridor to the north of the atrium. Room 1 (see figure 5) has
south-facing windows and floor-to-ceiling glass sliding door overlooking the atrium. Room 2,
on the other hand has north facing window and floor-to-ceiling glass sliding door to the
exterior (see figure 6).
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Data set 2
This data set was recorded in Room 3 and Room 4 concurrently. These rooms are located adjacent
to each other. Room 3 (see figure 7) has west-facing windows and floor-to-ceiling glass sliding
door facing atrium from interior. Room 4 (see figure 8), on the other hand has east facing windows
and floor-to-ceiling glass sliding door also facing the atrium from interior.
Data set 3
This data set was recorded in Cinema 2 and 7 concurrently. These Cinemas are located
opposite to each other. Cinema 2 (see Figure 9) located northward while Cinema 7 (see figure
10), on the other hand is located southwards both with no exterior window.
Hypothesis tested
Null hypotheses [Ht01 and Ht02] were tested with the help of ANOVA for the temperature
and humidity data
Anova test for data set 1
Table 2. Anova for temperature data of shop1 and 2
Anova single factor
SUMMARY
groups count sum mean variance
Shop 1; Dl 1 [235] 5866,6 20,6322415 0,252115
Shop 2; Dl 2 [235] 5263,6 41,2256354 0,202162
ANOVA SS df MS F P-value F-crit
Source of variation
Between groups [78,24561] 501 88,25361 365,1864 1,62E-55 4,524031
Within groups [144,3654] 4 0,225687
Total 195,325 508
Ht01: There is no difference between the temperatures in Shop 1, and Shop 2 According to
table 2, Ht01 is rejected (i.e. there is a significant difference between the temperatures in shop
1, and shop 2). As seen in table 2, there are strong temperature fluctuations in shop 2 as
compared shop1. This fluctuation is probably due to the thermal mass effect in the building.
Shop 1 has more stable temperature because its north-west orientation and choice of building
material which is of a low density (brick). This prevents excessive warming in shop 1 and
keeps the indoor temperature at a certain level. Another point is that, shop 2 is expected to be
much hotter than the other two rooms because of the east-west orientation and choice of
building material which is of high density (concrete). On the other hand, average temperature
of this
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room might have been affected from lack of overhangs and the cooling effect of outdoor
vegetation.
Table 3. Anova for humidity data of shop1 and 2
Anova single factor
SUMMARY
Shop 1; Dl 1 [210] 18005 2,5742 4,256382
Shop 2; Dl 2 [285] 14114,5 37,5736 2,250042
Source of variation
Between groups [21002,36] 2 35462,36 5405,18 0 4,214031
Within groups [2145,354] 502 3,124057
Total 125,521 508
Ht02: There is no difference between the humidity in shop1, and 2.
According to table 3, Ht02 is rejected (i.e. there is a significant difference between the
humidity in shop 1, and shop 2). It is expected that shop 1 facing north-west orientation show
larger Humidity values than the other two rooms. However, shop 2 had more humidity; this
could be due to the broken sprinkler in shop 2 after which it was.
Table 4. Anova for temperature data of shop3 and 4
Anova single factor
SUMMARY
Shop 3; Dl 1 [235] 7536,6 25,6325165 0,252245
Shop 4; Dl 2 [235] 8263,6 36,2456354 0,252562
Source of variation
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Between groups [88,25361] 502 88,25361 365,1864 1,62E-55 3,542654
Within groups [125,3654] 4 0,225687
Total 195,325 504
Ht01: There is no difference between the temperatures in the two Shops (3 and 4).In table 4,
Ht01 is rejected (i.e. there is a significant difference between the temperatures in shop 3 ad
shop 4). Temperature values for these shops were close to each other although shop 3 faces
north-west and shop 4 faces east. This situation may be explained by the fact that Shop 3 has
floor-to-ceiling sliding door and small windows and on the other hand, shop 4 made use of
burnt brick for walling and has larger windows wh
Table 5. Anova for humidity data of shop3 and 4
Anova single factor
SUMMARY
Shop 3; Dl 1 [235] 14005 2,35602 3,256382
Shop 4; Dl 2 [235] 12114,5 37,00236 1,250042
Source of variation
Between groups [13562,36] 2 13562,36 5235,18 0 3,542524
Within groups [1358,354] 506 2,250057
Total 144,325 504
Ht02: There is no difference between the humidity in the two shops (3 and 4).
According to Table 5, Ht02 s rejected, there is a significant difference between the humidity
in the two rooms. Shop 4 is cooler than shop 3 because of the orientation of its large windows
facing the entrance foundation of 3.2m. Moreover this feature is known to retain humidity.
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Table 6. Anova for temperature data of cinema 2 and 7
Anova single factor
SUMMARY
Shop 3; Dl 1 [305] 7536,6 25,2225165 0,252220
Shop 4; Dl 2 [305] 7263,6 25,2456054 0,252521
Source of variation
Between groups [812,2361] 653 98,25361 1365,164 1,6E-551 3,542014
Within groups [502,3623] 4 0,225231
Total 1435,322 654
In Table 6, Ht01 is accepted because it shows that there is little or negligible difference
between the temperatures in Cinema 2 and Cinema 7,this is excusable with the fact that it’s a
cinema hall, therefore its requires no windows for lighting and its completely sealed up to
insulate sound. Although the excessive warming can be said to have resulted from the choice
of building material this is of a high density (concrete)
Table 7. Anova for humidity data of Cinema 2 and Cinema 7
Anova single factor
SUMMARY
Shop 3; Dl 1 [235] 12105 2,21402 3,224522
Shop 4; Dl 2 [235] 1322,5 28,10216 1,100252
Source of variation
Between groups [13242,36] 2 13024,36 4821,13 0 2,210524
Within groups [12452,354] 406 2,220157
Total 125,328 407
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In Table 7, Ht02 is accepted because it shows that there is little or negligible difference
between the Humidity in Cinema 2 and Cinema 7 and its at minimal range of 60%RH -
70%RH due to the walls being completely sealed up and insulated with no external openings
(windows), the Cinemas experience less climatic influence, though the humidity values at
specific time intervals are higher in Cinema 2 as compared with Cinema 7.
DISCUSSION
This study showed that temperature and humidity data graphs, and ANOVA test results were
compatible with each other. Findings about the effects of design-dependent parameters on
thermal conditions in the rooms are summarized as below:
Thermal mass effect.
Glazing type/size.
Solar orientation.
THERMAL MASS
High thermal mass in the thick concrete walls caused high temperature values of up to 29ºC
in spaces facing east and west (shop 2, shop 3, cinema 2 and cinema 7)
Low thermal mass in the brick walls caused low temperature value of up to 24ºC in spaces
facing north and east (shop 1 and shop 4)
Spaces with more thermal mass effect had higher temperature values. Cinema 2 and cinema 7
for instance, had more interior wall surfaces than those in Shop 2 and shop 3.
Thermal mass effect is more obvious in spaces with smaller or no windows (Cinema 2 and
Cinema 7).
GLAZING TYPE/SIZE
Spaces with high thermal mass and no windows gained more heat by day, therefore they were
hotter (Cinema 2 and Cinema 7).
Size of the east and west facing windows should be smaller to control the amount of sunlight
coming in, provided no sun shading device, special reflective glass or vegetation is to be used
(shop 2 and shop 3).
SOLAR ORIENTATION
Openings facing East West were hotter than those facing north directions (Shop 1, shop 2 and
shop 3 have higher values than that in Shop 4).
Depending on the orientation of the spaces, average temperatures in spaces changed; the
space facing North orientation were cooler (Shop 4).
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CONCLUSION
This study revealed that the effect of thermal mass was almost the same for all the rooms
investigated because most part of the building had been constructed with concrete. It was also
seen that building materials such as burnt bricks with high thermal storage capacity could
improve thermal performance of buildings in Hot-dry climatic conditions if appropriate
glazing are provided. Furthermore, other design parameters had an influence on thermal
performance of the case study building when the location of spaces and size and type of
glazing, open courtyard system, vegetation, open sky atrium and shading or sun control
devices are considered.
There are many design approaches to improve building thermal performance, such as,
environmental design, climate responsive design, energy efficient design, passive solar design,
passive and low energy architecture etc. All these design approaches aim to improve the
occupant’s thermal comfort and thermal performance energy. [The results of this research
helped to highlight the energy efficient features of the case study building].
CONTRIBUTION TO KNOWLEDGE
The development of mixed-use buildings such as an urban entertainment centre in Nigeria
today is regarded as "big ideas" of urban stratosphere. However, since the theoretical
framework of this research (i.e effects of design dependent variables on thermal comfort) was
expected to be responsible for the "technical details" as well as the Spaces, Forms and
Surfaces (i.e. Aesthetics) of the case study building, its incorporation in the design of any
facility in a hot dry climate would have contributed to additional knowledge which becomes a
big innovations in the following way:
a. Helped to highlight the key thermal efficient features that enhance thermal comfort which
can be applied in the design of an urban entertainment centre in hot dry climate of Nigeria.
b. Helped to show that Design-dependent elements such as reversed brick blocks, double
reflective glazed_lowE aluminum frame, large opening facing north-south, surrounding
vegetation, atrium/courtyard and shading tools with emphasis on the first three had a
28.1% increase in thermal comfort as deduced from simulation exercise carried on
Autodesk Ecotect 2011.
c. Helped to expose and increase the competence of future design professionals in line with
new design dependent strategies and possible construction techniques in tackling the issue
of thermal comfort in hot dry climatic regions of Nigeria.
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REFERENCES
Ahmed, F. T. (2012). Application of bioclimatic design principles in the design of jabi
lakeside resort. (Masters dissertation, Ahmadu Bello University, Zaria, 2012)
Çakir C. (2006). Assessing thermal comfort conditions; A case study on the metu faculty of
Architecture Building. (Masters dissertation, Ahmadu Bello University, 2006).
Retrieved from data base.
Fanger, P. O. (1970) Thermal Comfort: Analysis and Applications in Environmental Givoni,
B. (1976) Man, Climate and Architecture, Applied Science Publishers,
London.
Haynes, Joel and Salil T. (1996). "Does Entertainment Draw Shoppers? The Effects of
Entertainment Centres on Shopping Behavior in Malls." Journal of Shopping Centre
Research 3.2.
Haynes, Joel and Salil T. (1997)."Consumer Shopping Behavior in Malls with Large Scale
Entertainment Centres." Mid-Atlantic Journal of Business.
Jason (2005). "Understanding Satisfaction Formation of Shopping Mall Entertainment
Seekers": A Conceptual Model." ANZMAC Conference 2005: Broadening the
Boundaries, Freemantle Western Australia. 05-07 Dec.
Khaliq, A. S. (2009). Thermal comfort of an open space (sport stadium). (Masters
dissertation, university of glassgow,UK 2009) retrieved from
http://google.thermalcomfort/linkversion.
McMullan, R. (1998) Environmental Science in Building, McMillan Press Ltd., London.
Oluigbo, S. N. (2010). Evaluation of architectural design determinants for sustainable
tourism facilities in north-western Nigerian. Ph.D Research seminar, Department of
Architecture, Faculty of Environmental Design, Ahmadu Bello University, Zaria
Nigeria.
Osuala, E. C. (2005). Introduction to research Methodology. Onitsha: Africa-first publishers
Ltd.
Patrick Taffe (A qualitative Response Model of Thermal Comfort), Building and
Environment, Vol.32, 2, pp.115-121, 1997.Printed in Great Britain.
Peter Hoppe (Different Aspects of assessing indoor and outdoor Thermal Comfort) Energy
and Buildings 34 (2002) 661-665
Rassam, S. (2004) Climate Energy and Sustainable Design in Southern Ontario, Master
Thesis, Dalhousie University, Halifax, Canada.
Rohles FH. Temperature & Temperament. A psychologist looks at comfort. Ashrae Journal
2007; 49(2):14-22.
Shanu, K. (2010). An assessmentons of therma landscape gardens in a high-rise office building.
Sustainable development, 3(20),
3-12.
Thomas, D. (2002). Architecture and the Urban Environment-A vision for the new age.
Cape Town.
Veal, A. J. (2006). Research Methods or Leisure and Tourism. Third Edition. London:
prentice Hall.
69

Vol.2, No.1, pp.55-74, March 2014
Figure 1. Ground floor plan of the case-study building. SILVERBIRD galleria Abuja
Figure 2. Second floor plan of the case-study building. SILVERBIRD galleria Abuja
Figure 3. Fourth floor plan of the case-study building. SILVERBIRD galleria Abuja.
70

Vol.2, No.1, pp.55-74, March 2014
Figure 4. Floor plan, section ZZ and exterior view of Figure 5. Floor plan, section XX, and
exterior view of Shop 1. (Photo by the author.) Shop2. (Photo by the author.)
Shop 1 and shop 2 - Temperature and Humidity chart- Data Set 1 (7th
-14th
April 2013). Source: Author
(2013)
71

Vol.2, No.1, pp.55-74, March 2014
Figure 6. Floor plan, section YY and exterior view of Figure 7. Floor plan, section XX, and
exterior view of Shop 3. (Photo by the author.) Shop4 . (Photo by the author.)
Shop 3 and shop 4 - Temperature and Humidity chart- Data Set 1 (18th
-24th
May 2013). Source: Author
(2013)
72

Vol.2, No.1, pp.55-74, March 2014
Figure 8. Floor plan, interior and exterior view of Figure 9. Floor plan, interior and exterior
view of Shop 2. (Photo by the author.) Shop7 . (Photo by the author.)
Shop 2 and shop - Temperature and Humidity chart- Data Set 1 (18th
-24th
May 2013). Source: Author
(2013)
73

Vol.2, No.1, pp.55-74, March 2014
ACKNOWLEDGEMENTS
I am most grateful to God Almighty for His mighty acts and favour throughout this program. I
would like to express my sincere gratitude to Dr. Musa L. Sagada and Dr. Amina L.
Batagarawa for their guidance and patience as my supervisors throughout the research. This
study would not have been possible without their supporting advice, invaluable comments,
and suggestions. I am also grateful to Prof. B. Prucnal-Ogunsote, Arc E.O.A Eneh and Arc
Arc A.S Salisu for their contributions as my External & internal examiners, I am grateful to
Prof. & Mrs. S.P Ejeh, Mr. & Mrs. Graham Nuhu, Arc. David Ejeh, Prof. Charles A.
Malgwi, Dr Steve Oluigbo, Arc. Muktar, Dr. A. S. Ahmed (Head of Department), Gloria
Christian, Mathew Oloche, Hauwa Katsina hassan, Tolu Oshodi, Osman Makwa, Saratu Bala,
Lolah Awotunde, Peter Odih, Chioma Onyewotu, Gloria Akafi and management of silverbird
galleria Abuja, My beloved friends, and well-wishers for their essential technical and practical
contributions to this project. My special thanks and love go to my family (Prof & Dr (Mrs.)
Mohammed Malgwi, Jemimah & Dzarma) for their continuous support, endless love,
patience, and encouragement during the most difficult days and sleepless nights of the study.
Without their help, I would never have been able to complete it.
74

published journal_Esther Malgwi & Dr. Sagada

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